The DNA damage-dependent intra–S phase checkpoint is regulated by parallel pathways View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2002-03

AUTHORS

Jacob Falck, John H.J. Petrini, Bret R. Williams, Jiri Lukas, Jiri Bartek

ABSTRACT

To preserve genetic integrity, mammalian cells exposed to ionizing radiation activate the ATM kinase, which initiates a complex response-including the S-phase checkpoint pathways-to delay DNA replication. Defects in ATM or its substrates Nbs1 or Chk2 (ref. 3), the Nbs1-interacting Mre11 protein, or the Chk2-regulated Cdc25A-Cdk2 cascade all cause radio-resistant DNA synthesis (RDS). It is unknown, however, whether these proteins operate in a common signaling cascade. Here we show that experimental blockade of either the Nbs1-Mre11 function or the Chk2-triggered events leads to a partial RDS phenotype in human cells. In contrast, concomitant interference with Nbs1-Mre11 and the Chk2-Cdc25A-Cdk2 pathways entirely abolishes inhibition of DNA synthesis induced by ionizing radiation, resulting in complete RDS analogous to that caused by defective ATM. In addition, Cdk2-dependent loading of Cdc45 onto replication origins, a prerequisite for recruitment of DNA polymerase, was prevented upon irradiation of normal or Nbs1/Mre11-defective cells but not cells with defective ATM. We conclude that in response to ionizing radiation, phosphorylations of Nbs1 and Chk2 by ATM trigger two parallel branches of the DNA damage-dependent S-phase checkpoint that cooperate by inhibiting distinct steps of DNA replication. More... »

PAGES

290-294

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/ng845

DOI

http://dx.doi.org/10.1038/ng845

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1047129480

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/11850621


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